...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Activity of Desulfitobacterium sp strain Viet1 demonstrates bioavailability of 2,4-dichlorophenol previously sequestered by the aquatic plant Lemna minor
【24h】

Activity of Desulfitobacterium sp strain Viet1 demonstrates bioavailability of 2,4-dichlorophenol previously sequestered by the aquatic plant Lemna minor

机译：Desulfitobacterium sp菌株Viet1的活性证明了以前被水生植物Lemna minor隔离的2,4-二氯苯酚的生物利用度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Aquatic plants take up and sequester organic contaminants such as chlorophenols through incorporation in cell wall materials and storage in vacuoles. The ultimate fate of plant-sequestered chlorophenols, however, remains unclear. This research investigated 2,4-dichlorophenol (2,4-DCP) sequestration by the aquatic plant Lemna minor and evaluated contaminant release and bioavailability after plant death and cellular disruption. C-14-labeled 2,4-DCP was used to establish that contaminant removed from the aqueous phase was retained internal to L. minor. An assay with Desulfitobacterium sp. strain Viet1 was used to assess the readily bioavailable fraction of plant-sequestered 2,4-DCP and plant metabolites of 2,4-DCP. In plant-free systems, strain Viet1 dechlorinated 2,4-DCP to stoichiometric amounts of 4-chlorophenol (4-CP) as a stable and quantifiable end product. Anaerobic microcosms containing inactivated L. minor, which had accumulated 3.8 mu mol of 2,4-DCP equivalents/g of plant material (fresh weight) during a preceding aerobic exposure, were inoculated with strain Viet1. After 118 d of incubation with strain Viet1, 43.5% (+/- 1.4%) of the contaminant was recovered as 4-CP, indicating a large portion of plant-sequestered 2,4-DCP was bioavailable for dechlorination by strain Viet1. In contrast, 4-CP formation was not observed in autoclaved microcosms, and only 26.1% (+/- 1.0%) of plant-sequestered 2,4-DCP was recovered in the aqueous phase. These findings demonstrate contaminant cycling between plants and microorganisms, and emphasize that understanding the mechanisms and pathways of contaminant sequestration by plants is critical for predicting long-term contaminant fate.
机译：水生植物通过掺入细胞壁材料并储存在液泡中，吸收并隔离有机污染物，例如氯酚。然而，尚不清楚植物所含氯酚的最终命运。这项研究调查了水生植物Lemna minor螯合的2,4-二氯苯酚（2,4-DCP），并评估了植物死亡和细胞破坏后污染物的释放和生物利用度。使用C-14标记的2,4-DCP来确定从水相中去除的污染物被保留在较小的利什曼原虫内部。用脱硫杆菌属种进行的测定。 Viet1菌株用于评估植物定植的2,4-DCP和2,4-DCP植物代谢产物的易生物利用度。在无植物系统中，Viet1菌株将2,4-DCP脱氯至化学计量的4-氯苯酚（4-CP），作为稳定且可量化的最终产品。用Viet1菌株接种含有灭活的小L.的厌氧微生物，该微生物在先前的有氧暴露过程中积累了3.8 mol的2,4-DCP当量/ g植物材料（鲜重）。与Viet1菌株温育118天后，回收了43.5％（+/- 1.4％）的污染物，成为4-CP，这表明大部分植物杂化的2,4-DCP可被Viet1菌株生物脱氯。相反，在高压灭菌的缩影中未观察到4-CP的形成，在水相中仅回收了26.1％（+/- 1.0％）的植物异戊二烯化2,4-DCP。这些发现证明了污染物在植物与微生物之间的循环，并强调了解植物螯合污染物的机制和途径对于预测长期的污染物命运至关重要。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号